A New Cotton Variety-Baimian 2

Baimian 2 is a new early maturing cotton variety with high yield, high quality and resistance to diseases and insect pests. The growth period is 107 to 112 days. The variety has a tube type, moderate tightness, purple and hairy stems, medium-sized leaves, light green leaves, strong boll-setting ability, 9.2 bolls per plant, round bolls, 5.12g boll weight, thin boll shell and concentrated lint percentage. Early maturity, high yield and high yield stability are good. Before frost, the flowering rate was 88.41%, the average plant height was 76.72cm, the first fruit branch was 5.47 nodes, the average number of fruit branches was 9.95, the seed index was 10.16g, and the rate of sterile seeds was 7.49%. Fiber quality: 2.5% average span length 27.73mm, average specific strength 29.27cN/tex, average micronaire value 4.39, spinning evenness index 131.86. The cotton fiber quality tested by the Cotton quality Supervision, Inspection and Test Center of the Ministry of Agriculture reached the national breeding target of the Tenth five-year Plan. The disease and insect resistance tests of Cotton Research Institute of Chinese Academy of Agricultural Sciences showed that Fusarium wilt index was 2.57, Verticillium wilt index was 37.42, and cotton bollworm resistance. The variety showed the characteristics of early maturity, stamina, high quality, high yield, strong stress resistance, good disease and insect resistance, high resistance to Fusarium wilt and Verticillium wilt. It is an excellent new variety with development value.

The yield is high. According to the average results of 22:00 sub-regional and production tests in two years, Baimian 2 lint and pre-frost lint increased by 25.96% and 31.84% respectively compared with the control Zhongmian 30, and the yield increased by 25.96% and 31.84%, respectively. In the regional trial of short season cotton varieties in Henan Province in 2002, the yield per mu of seed cotton, pre-frost seed cotton, lint cotton and pre-frost lint cotton was 220.20kg, 194.89kg, 91.44kg and 81.46kg, which increased by 24.15%, 28.9%, 31.38% and 36.86% respectively compared with the control variety Zhongmian 30. In 2003, the yield per mu of seed cotton, lint cotton and pre-frost lint cotton were 132.40kg, 51.31kg and 38.53kg, which increased by 20.65%, 27.99% and 36.64%, respectively, compared with the control variety Zhongmian 30. The average yield per mu of seed cotton, lint cotton and pre-frost lint cotton in two years were 176.30kg, 71.38kg and 60kg, which were 22.4%, 29.69% and 36.75% higher than the control variety Zhongmian 30, respectively. Taking part in the production experiment in 2003, the per mu yield of seed cotton, lint cotton and pre-frost lint cotton was 127.6kg, 50.0kg and 43.9kg, which increased by 10.9%, 16.6% and 18.8% respectively compared with the control variety Zhongmian 30.

Key points of cultivation techniques ① sowing date and density: two-one or three-one type of wheat ridge planting, should be combined with irrigated wheat yellow water to make soil moisture, sowing in the wheat ridge around May 20. It can also raise seedlings before wheat harvest and transplant after wheat harvest. Density per mu: 5500-6000 plants per mu in medium fertility cotton field, which can be increased or decreased with the change of soil fertility. ② fertilization: on the basis of sufficient basal fertilizer in the previous crop, urea 5kg/ mu was applied at seedling stage, urea 15kg/ mu was applied again and boll fertilizer was applied, and potassium dihydrogen phosphate was sprayed twice in the later stage to prevent premature senility. ③ is properly chemically controlled to maintain steady growth.